8639742064 has 20 divisors (see below), whose sum is σ = 16746729480. Its totient is φ = 4318005440.

The previous prime is 8639742061. The next prime is 8639742109. The reversal of 8639742064 is 4602479368.

It is a junction number, because it is equal to n+sod(n) for n = 8639741999 and 8639742017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8639742061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78007 + ... + 152854.

It is an arithmetic number, because the mean of its divisors is an integer number (837336474).

Almost surely, 2^8639742064 is an apocalyptic number.

It is an amenable number.

8639742064 is a deficient number, since it is larger than the sum of its proper divisors (8106987416).

8639742064 is a wasteful number, since it uses less digits than its factorization.

8639742064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233208 (or 233202 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

The square root of 8639742064 is about 92950.2128238553. The cubic root of 8639742064 is about 2051.9507161627.

The spelling of 8639742064 in words is "eight billion, six hundred thirty-nine million, seven hundred forty-two thousand, sixty-four".